Convertible sofa



FIG. 1 is a front and side perspective view of a convertible sofa, showing my new design;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a side elevational view thereof, taken from the left of FIG. 2, the elevational view thereof opposite that shown in FIG. 3 being the mirror image thereof;

FIG. 4 is a rear elevational view thereof;

FIG. 5 is a bottom plan view thereof;

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a front and side perspective view thereof, showing the convertible sofa in a bed position. 

The ornamental design for a convertible sofa, as shown and described. 